figure 9.7).
The advantages of CT virtual simulation can be summarized as follows:
• full 3D simulation allowing unique verification of beam coverage and avoidance in 3D
• beams can be simulated and verified that are not possible with conventional simulation, e.g. vertex fields
• the verification image – the DRR – can contain more information than conventional simulation and can be manipulated to enhance tumour visualization
• there is a much closer connection to diagnostic information with CT simulation allowing integration of multimodality images.